— Fidel CastroContext: I would dare say that today this species is facing a very real and true danger of extinction, and no one can be sure, listen to this well, no one can be sure that it will survive this danger.
Well, the fact that the species would not survive was discussed about 2,000 years ago. I remember that when I was a student I heard of the Apocalypse, a book of prophesy in the Bible. Apparently, 2000 years ago someone realized that this weak species could one day disappear.

— Fidel CastroContext: Revolution is the sense of the historical moment; it is changing everything that must be changed; it is full equality and freedom; it is being treated and treating others like human beings; it is emancipating ourselves, by ourselves and with our very own efforts; it is challenging the dominant powerful forces within and outside of the social and national arena; it is defending the values one believes in at the cost of any sacrifice; it is modesty, selflessness, altruism, solidarity and heroism; it is fighting with audacity, intelligence and realism; it is never telling a lie or violating ethical principles; it is the profound conviction that there is no force on earth that can crush truth and ideas. Revolution is unity, it is independence, it is fighting for our dreams of justice for Cuba and the world that is the basis of our patriotism, our socialism and our internationalism.
As quoted in Speech by Dr. Fidel Castro Ruz, President of the Republic of Cuba, at the mass rally called by the Cuban youths, students and workers on the occasion of the International Labor Day at the Revolution Square http://www.fidelcastro.cu/en/discursos/speech-mass-rally-called-cuban-youths-students-and-workers-revolution-square-occasion (May 1, 2000)

— Fidel CastroContext: Man is born egotistical, a result of the conditioning of nature. Nature fills us with instincts; it is education that fills us with virtues. Nature makes us do things instinctively; one of these is the instinct for survival which can lead to infamy, while on the other side, our conscience can lead us to great acts of heroism. It doesn’t matter what each one of us is like, how different we are from each other, but when we unite we become one.
It is amazing that in spite of the differences between human beings, they can become as one in a single instant or they can be millions, and they can be a million strong just through their ideas. Nobody followed the Revolution as a cult to anyone or because they felt personal sympathy with any one person. It is only by embracing certain values and ideas that an entire people can develop the same willingness to make sacrifices of any one of those who loyally and sincerely try to lead them toward their destiny.

— Fidel CastroContext: Man is born egotistical, a result of the conditioning of nature. Nature fills us with instincts; it is education that fills us with virtues. Nature makes us do things instinctively; one of these is the instinct for survival which can lead to infamy, while on the other side, our conscience can lead us to great acts of heroism. It doesn’t matter what each one of us is like, how different we are from each other, but when we unite we become one.
It is amazing that in spite of the differences between human beings, they can become as one in a single instant or they can be millions, and they can be a million strong just through their ideas. Nobody followed the Revolution as a cult to anyone or because they felt personal sympathy with any one person. It is only by embracing certain values and ideas that an entire people can develop the same willingness to make sacrifices of any one of those who loyally and sincerely try to lead them toward their destiny.

— Fidel CastroEarly in 1976, speaking to Margaret Trudeau, according to page 317 of Just Watch Me: The Life of Pierre Elliott Trudeau, 1968-2000 https://books.google.ca/books?id=ACC_G_kiR4cC&pg=PA317&lpg=PA317 by John English.